Keys to Lichens of North America : revised and expanded /
Brodo, Irwin M.,author.
Sharnoff, Sylvia Duran,1944-illustrator.
Sharnoff, Stephen,1944-illustrator.
Laurie-Bourque, Susan,illustrator.
Includes bibliographical references (pages 383-392) and index.
"Published with the collaboration of the Canadian Museum of Nature, Ottawa, Ontario, Canada."
Lichens